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Registros recuperados: 45
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Aspectos da biologia reprodutiva de Bothrops jararaca em cativeiro (Serpentes, Viperidae) Iheringia, Sér. Zool.
Alves,Maria Lúcia Machado; Leitão-de-Araujo,Moema; Witt,André Alberto.
The reproduction of Bothrops jararaca (Wied, 1824) in captivity in ordened to determine the intercourse period, births, number of neonates, proportion of males and females per litter were performed between 1989 and 1999. Fifty eight females were observed, 16 intercourses in captivity, 45 females arrived already fertilized from nature and 53 litters, resulting on the birth of 426 live neonates, 67 infertile egg masses, 18 stillborn neonates and 4 abnormal neonates. The intercourse period was from february to december and the births happened between february and may. From the two gestacional periods observed, the shortest one was 152 days and the longest 239. The average amount of live neonates per litter was 8,04. Among 323 neonates, 47,68% were males and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bothrops jararaca; Reproductive cycle; Neonates; Development; Captivity.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212000000200009
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Bio-écologie des cétacés et enjeux de leur conservation pour les Etats côtiers africains comme le Sénégal OceanDocs
Ndao, Ibrahima.
Tipo: Theses and Dissertations Palavras-chave: Whaling; Anatomy; Morphology (biology); Physiology (fish); Preservation (fishery products); Biodiversity; Baleens; Migrations; Reproductive cycle; Fish consumption; Overfishing; Pollution.
Ano: 2006 URL: http://hdl.handle.net/1834/5005
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Biología reproductiva de algunas especies de la tribu Thenaria (Cnidaria: Anthozoa) en el litoral marplatense OceanDocs
Excoffon, A.C..
Universidad Nacional de Mar del Plata, Facultad de Ciencias Exactas y Naturales (Argentina).
Tipo: Theses and Dissertations Palavras-chave: Sexual reproduction; Asexual reproduction; Gametogenesis; Reproductive cycle; Embryonic development; Larval development; Comparative studies; Asexual reproduction; Gametogenesis; Embryonic development; Sexual reproduction; Http://aims.fao.org/aos/agrovoc/c_664; Http://aims.fao.org/aos/agrovoc/c_27931; Http://aims.fao.org/aos/agrovoc/c_2545; Http://aims.fao.org/aos/agrovoc/c_26876.
Ano: 1993 URL: http://hdl.handle.net/1834/2957
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Ciclo reproductivo y fecundidad del lenguado Paralichthys patagonicus Jordan, Jordan y Goss 1889 OceanDocs
Macchi, G.J.; Diaz de Astarloa, J.M..
The reproductive characteristics of the flounder (Paralichthys patagonicus)are analyzed on the basis of the microscopic and macroscopic study of the ovaries. Preliminary estimations of the fecundity of this species are also made. The samples were obtained from the monthly commercial langings in Mar del Plata and from research cruises undertaken by the INIDEP. A total of 641 ovaries were studied; 210 of which were selected for the histological analysis. 24 ovaries with hydrated oocytes and without post-ovulatory follicles were used to determine batch fecundity. A macroscopic maturity scale of five stages was established. The histological analysis allowed to introduce three substage within the maturation stage including a partial spawning stage. According to...
Tipo: Journal Contribution Palavras-chave: Reproductive cycle; Fecundity; Ovaries; Ovaries; Fecundity; Http://aims.fao.org/aos/agrovoc/c_5456; Http://aims.fao.org/aos/agrovoc/c_15725.
Ano: 1996 URL: http://hdl.handle.net/1834/1960
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Ciclo reprodutivo de machos de Liolaemus occipitalis Boulenger (Sauria, Tropiduridae) Zoologia
Verrastro,Laura; Krause,Lígia.
The aim of this work is to describe the reprodutive cycle of the males of L. occipitalis from the coastal sand-dunes of Rio Grande do Sul State, Brazil. It was carried out between April/86 and March/88, at Jardim Atlântico Beach, Tramandaí, Rio Grande do Sul. These lizards showed reprodutive activity between September and December, with a retreat period during January and February. The seasonality of the reprodutive cycle became fully evident by the monthly variation of the testicular mass, showing an inverse relation with the temperature along the year.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tropiduridae; Liolaemus; Neotropical lizards; Reproductive cycle.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000100019
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Cycle sexuel et fécondité du mâchoiron Chrysichthys nigrodigitatus en lagune Ebrié, Côte d'Ivoire. OceanDocs
Otémé, Ziriga Josué.
L'évolution saisonnière du développement des gonades chez les femelles de Chrysichthys nigrodigitatus en lagune Ebrié (Côte d'Ivoire) a été étudiée sur un cycle annuel de reproduction. Sept stades macroscopiques de maturation des gonades ont été identifiés. Ces poissons ne pondent qu'une seule fois durant une saison de reproduction qui s'étend de juillet à novembre. La fécondité potentielle varie entre 4878 et 87724 ovocytes et 5438 et 36257 ovocytes respectivement pour le milieu naturel et le milieu d'élevage. La corrélation entre la fécondité et la longueur du poisson est légèrement plus marquée que celle entre la fécondité et et le poids des gonades
Tipo: Journal Contribution Palavras-chave: Reproductive cycle; Pond culture.
Ano: 1993 URL: http://hdl.handle.net/1834/5519
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Cycles saisonniers, reproduction et qualite des ovocytes chez Pecten maximus en rade de Brest ArchiMer
Paulet, Yves-marie; Bekhadra, Farida; Devauchelle, Nicole; Donval, Anne; Dorange, Germaine.
This work is part of the program, "recruitment determinism in scallops" initiated in 1992 by the "Contrat de Baie". The aim of this research was to explain interannual abundance fluctuations observed for Pecten maximus, in the Bay of Brest. To this end an analytical approach to the life cycle of the species was undertaken to determine its critical phases. A phase may be considered as "critical" if the mortality rate at its level varies from one year to the other. Using data from 1989 to 1994, a precise time-table of the "physiological year" of the scallop in the Bay of Brest was determined. Fecundity and gamete production kinetics were estimated from the annual variation in the weight indices of the gonad. In the laboratory, egg quality was estimated...
Tipo: Text Palavras-chave: Pecten maximus; Recruitment; Reproductive cycle; Digestion.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/00044/15495/12861.pdf
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Descrição do ciclo reprodutivo de Donax hanleyanus (Bivalvia, Donacidae) no sul do Brasil Iheringia, Sér. Zool.
Gil,Guacira M.; Thomé,José W..
The changes in gonadal development in male and female of Donax hanleyanus Philippi, 1847 are described. Gonad development and spawning seasons were assessed by monthly sampling of population from Arroio Teixeira beach, southern Brazil. Histological examination of clams showed in the most of the adult population sampled that the spawning is practically continuous, without any period of sexual rest. There are two main periods of gametogenesis, in winter and in summer, being the degree of maturation longer in the latter. The water temperature is stimulant on gametes proliferation and spawning.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Donax; Reproductive cycle; Spawning season.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000300008
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Diet, sexual dimorphism and reproduction of sympatric racers Philodryas aestiva and Philodryas patagoniensis from the coastal Brazilian Pampa Anais da ABC (AABC)
QUINTELA,FERNANDO M.; LOEBMANN,DANIEL.
Abstract: Herein we investigated diet, sexual dimorphism and reproductive biology of two sympatric congeneric species at the coastal Brazilian Pampa, Philodryas aestiva and P. patagoniensis. Analysis of the stomach content of the scansorial Philodryas aestiva revealed that it feeds mainly on Anura and small mammals, while it occasionally consumes Insecta, Squamata and Aves. The more terrestrial Philodryas patagoniensis presented a broader diet, composed mainly of Anura, Squamata and small mammals. Insecta and Actinopterygii were found in lower frequencies. In females of both species, snout-vent length was significantly larger than in males, while tail length/snout-vent length ratio was significantly higher in males. Males reach sexual maturity at smaller...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding habits; Natural history; Neotropical snakes; Fecundity; Reproductive cycle.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100633
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Dinámica de la metapoblación de almeja panopea Panopea abbreviata en los golfos norpatagónicos OceanDocs
Zaidman, P.C..
Panopea abbreviata es el molusco bivalvo infaunal de mayor tamaño del Mar Argentino. Se distribuye desde Río de Janeiro (Brasil) hasta la Patagonia Argentina. En los golfos San Matías (GSM) y San José (GSJ), conforma una metapoblación que presenta una distribución discontinua, formada por una serie de poblaciones ubicadas a lo largo de las costas.Es el bivalvo más longevo explotado en el Atlántico Sur. En el GSM su pesquería comenzó en el año 2000 y, si bien la misma es incipiente, debido a las características biológico-poblacionales de P. abbreviata es un recurso que requiere de un manejo precautorio. Excepto por estudios preliminares sobre el crecimiento y el ciclo reproductivo, no se contaba con la información básica para manejo. El objetivo general del...
Tipo: Theses and Dissertations Palavras-chave: Fishery biology; Marine molluscs; Population dynamics; Sustainable management; Age; Growth; Mortality rate; Recruitment; Population structure; Spatial variations; Sex composition; Reproductive cycle; Histology; Environmental conditions.
Ano: 2013 URL: http://hdl.handle.net/1834/5236
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El comportamiento reproductivo del besugo (Pagrus pagrus)en el ecosistema costero bonaerense. OceanDocs
Cotrina, C.P.; Christiansen, H.E..
The species, like other members of the Family Sparidae, has a hermaphroditic phase in its sexual development, affecting the population partially during the first period of life. The sexual differentiation mechanisms have been inferred by the way of macroscopic characterization and proportionality of the different stages observed during the first five year classes. The highest proportion of specimens with bisexual gonads is observed during the third year of life: from the macroscopical point of view, both sexes are equally developed or with predominance of the masculine crest; microscopically, both are functional and synchronous. The masculine portion demostrate a normal expulsion of germ cells and in the ovaric part post-ovulatory and atretic follicles...
Tipo: Journal Contribution Palavras-chave: Reproductive cycle; Ovaries; Ovaries; Http://aims.fao.org/aos/agrovoc/c_5456.
Ano: 1994 URL: http://hdl.handle.net/1834/1929
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Estrategias reproductivas de moluscos bivalvos y equinoideos OceanDocs
Calvo, J.; Morriconi, E.; Orler, P..
The theoretical aspects of reproductive strategies and life histories are analyzed. The gonadal structures and the main features of gametogenesis of bivalves and echinoids are described. Research on the reproductive characteristics and gametogenic cycles of the bivalve molluscs in the Argentinian littoral and the echinoid Loxechinus albus is reviewed. Special references to Mytilus edulis, Aulacomya ater, Brachidontes purpuratus, Aequipecten tehuelchus, Zygochlamys patagonica, Ostrea puelchana, Clausinella gayi, Protothaca antiqua, Eurhomalea exalbida and Mesodesma mactroides are made. Analysis of reproductive cycles includes histological and ponderal descriptions of gonadal variations. The main trend found is the partial and multiple spawning episodes....
Tipo: Book Section Palavras-chave: Hermaphroditism; Gametogenesis; Life cycle; Marine molluscs; Reproduction; Reproductive cycle; Hermaphroditism; Gametogenesis; Life cycle; Reproduction; Http://aims.fao.org/aos/agrovoc/c_3571; Http://aims.fao.org/aos/agrovoc/c_27931; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507.
Ano: 1998 URL: http://hdl.handle.net/1834/2581
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Etude cytologique de la gamétogenèse, de la sex-ratio et du cycle de reproduction chez l'huître perlière Pinctada margaritifera (L) var. cumingii (Jameson), (mollusques, bivalves). Comparaison avec le cycle de Pinctada maculata (Gould) ArchiMer
Thielley, Maryse.
The population of Pinctada margaritifera and Pinctada maculata lay eggs throughout the year. Temperature variations induce huge but asynchronous laying. Preferential periods of gonad maturity correspond to the season changings in both species. However. some differences between the two specics are noticed. Both species are protandric hermaphrodites. Female condition is unstable: a reversion to the male condition may be observed and is probably linked with stress. The average size for the first sexual maturation as weil as for sexual conversion are specified in P. margaritifera. The breeding conditions induce modifications in some reproductive cycle processes (maturation, sex-ratio). Some conditions suitable for reproduction may become unfavorable to...
Tipo: Text Palavras-chave: Gamétogenèse; Cycle de reproduction; Sex-ratio; Pinctad margaritifera; Mollusque; Bivalve; Huître perlière; Gametogenesis; Reproductive cycle; Sex-ratio; Pinctada margaritifera; Mollusca; Bivalvia; Pearl oyster.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00440/55208/56677.pdf
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Etude de la dynamique de population de <Talitrus saltator> (crustace, amphipode) issu de la plage de Bizerte OceanDocs
Ayari-Akari, A.; Nasri-Ammar, K..
La dynamique de population de l’Amphipode supralittoral Talitrus saltator (Montagu, 1808) a été étudiée mensuellement de juin 2007 à décembre 2008, au niveau de la plage de Bizerte (37°19’17.1”N; 09°51’57.3”E). Durant cette période, 2073 spécimens de Talitrus saltator ont été identifiés. La reproduction est saisonnière, s’étendant de mars à novembre avec une période de repos sexuel pendant l’hiver. La sex-ratio globale est égale à 0,74 révélant ainsi un déséquilibre en faveur des femelles; cependant, au niveau des prélèvements des mois de juillet, août et octobre 2007 et des mois de mai, août et septembre 2008, ce déséquilibre s’inverse en faveur des mâles. En effet, la taille de la ponte augmente avec celle des femelles. Au cours de cette étude, trois...
Tipo: Journal Contribution Palavras-chave: Reproductive cycle; Marine crustaceans.
Ano: 2013 URL: http://hdl.handle.net/1834/5900
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Gametogenic cycle and reproductive effort of the tropical blacklip pearl oyster, Pinctada margaritifera (Bivalvia : Pteriidae), cultivated in Takapoto atoll (French Polynesia) ArchiMer
Pouvreau, Stephane; Gangnery, Aline; Tiapari, Jerome; Lagarde, Franck; Garnier, Matthieu; Bodoy, Alain.
The gametogenic cycle and the reproductive effort of the blacklip pearl oyster, Pinctada margaritifera, cultivated in Takapoto lagoon were studied for a 1-year period (March 1997-April 1998) by bimonthly observations of gonadal sections, dry tissue weights and gonadal index in a population of pearl oyster composed of three age-groups. pearl oysters attained sexual maturity in the end of their first year (height approximate to 40 mm), implying that P. margaritifera is a late-maturing species in comparison with other Pteriidae. This species was also confirmed to be a marked protandrous successive hermaphrodite in culture, with 100 % of males at first maturity and 75 % in older pearl oyster (height > 120 mm). The general pattern of gametogenic activity,...
Tipo: Text Palavras-chave: French Polynesia; Reproductive effort; Reproductive cycle; Tropical aquaculture; Gametogenesis; Blacklip pearl oyster; Polynésie française; Effort de reproduction; Cycle de reproduction; Aquaculture tropicale; Gamétogenèse; Huître perlière.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/2000/publication-1391.pdf
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Gonadal steroids levels and vitellogenesis in the formation of oocytes in Prochilodus lineatus (Valenciennes) (Teleostei: Characiformes) Neotropical Ichthyology
Hainfellner,Patrick; Souza,Thiago Gonçalves de; Moreira,Renata Guimarães; Nakaghi,Laura Satiko Okada; Batlouni,Sergio Ricardo.
The objective of this study was to obtain information about the possible mechanisms related to poor reproductive performance in tropical rheophilic fish. To that effect, cages (Cs) and earthen ponds (EPs) were used as experimental systems to provide unsuitable and suitable conditions, respectively, for curimbatá (Prochilodus lineatus) breeders. Fish were maintained under experimental conditions for 18 months, and during this period females were randomly sampled every two months for biometric analysis (n=30), blood (n=5/sampling) and ovary (n=5/sampling). After this period EPs females (EPFs) and Cs females (CFs) were submitted to the induced breeding experiments. The results showed that rearing curimbatá for such long time in a cage at this stocking...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reproductive cycle; Spawning performance; Steroid levels; Tropical rheophilic fish.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300014
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Historia de vida y dinámica de poblaciones de Lychnorhiza lucerna (Scyphozoa) ¿Un recurso pesquero alternativo? OceanDocs
Schiariti, A..
In this Thesis we presented the first steps in the study of the life history and population dynamics of Lychnorhiza lucerna as well as the possibilities of development of its fishery in Argentina. L. lucerna presented a metagenetic life cycle characteristic of most scyphozoans. Polyps reproduced asexually by the production of podocysts and polidisk strobilation. The combination of both types of asexual reproduction resulted in a high strobilation rates indicating that the abundance of medusae would strongly depend on polyps abundance and reproduction. The absence of ephyrae in the Río de la Plata estuary suggest that L. lucerna doest not complete its life cycle locally but medusae would be produced by polyps located northwards along the Uruguayan or...
Tipo: Theses and Dissertations Palavras-chave: Life cycle; Life history; Population dynamics; Reproductive cycle; Biomass; Estuarine fisheries; Life history; Biomass; Estuarine fisheries; Life cycle; Population dynamics; Http://aims.fao.org/aos/agrovoc/c_12170; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_2674; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6111.
Ano: 2008 URL: http://hdl.handle.net/1834/3109
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Mobilization of energetic substrates in the endangered catfish Steindachneridion parahybae (Siluriformes: Pimelodidae): changes in annual reproductive cycle in captivity Neotropical Ichthyology
Tolussi,Carlos E.; Gomes,Aline D.; Ribeiro,Cristiéle da S.; Caneppele,Danilo; Moreira,Renata G.; Honji,Renato M..
ABSTRACT This study aimed at analyzing the energetic substrate (ES) in the main storage tissues of Steindachneridion parahybae, throughout the reproductive cycle in captivity. Differently from wild, in captivity, feeding is not interrupted during the reproductive period, the females do not spawn spontaneously, and they are sedentary. Adult females were sampled monthly and based on their histology and gonadosomatic index (GSI), ovaries were classified into: previtellogenic (PRV), vitellogenic (VTG), and regression (REG) stages. Ovaries at the VTG stage showed higher protein and lipids levels than at the PRV stage with a positive correlation between these substrates and the GSI. Muscle was the main source of proteins transferred to the ovaries, according to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycogen; Lipids; Metabolic substrate; Protein; Reproductive cycle.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000200208
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Observaciones sobre el ciclo reproductivo del mero, Acanthistius brasilianus (Serranidae, Pisces) OceanDocs
Dell'Arciprete, O.P.; Christiansen, H.E.; Diaz de Astarloa, J.M..
The present paper deals with the study of the reproductive cycle of the sea-bass (Acanthistius brasilianus). Its main objective is getting some advance in the inderstanding of the gonad cycle of the sea-bass and the comprehension of its mode of reproduction. The study is emphasized on tahe females because it is thought that they permit a better analysis in this first stage of the reseach work. Some basic aspects, such as the anatomical and the histological description of the gonadas, the study of ovocyte maturation phases and the development of ovary maturity scales were into account. The gonad cycle was analized throughout the year by means of different approaches; histological analysis of ovary preparation and by following the statistical structure of...
Tipo: Journal Contribution Palavras-chave: Sexual maturity; Reproductive cycle; Reproduction; Ovaries; Testes; Ovaries; Sexual maturity; Reproduction; Testes; Http://aims.fao.org/aos/agrovoc/c_5456; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_7682.
Ano: 1987 URL: http://hdl.handle.net/1834/2004
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Observations macroscopiques des gonades de deux espèces de Mugilidés: Liza falcipinnis et Mugil cephalus. OceanDocs
Djadji, E.L.G.; Sylla, S.; Atsé, B.C..
L'étude descriptive de ces différents stades de maturation sexuelle nous permettra de mieux cerner l'approche macroscopique des observations. Elle est d'autant plus importante que le dimorphisme sexuel dans cette famille est inexistant et que la détermination du sexe des individus nécessite une dissection.
Tipo: Journal Contribution Palavras-chave: Fish species; Reproductive cycle.
Ano: 2010 URL: http://hdl.handle.net/1834/5775
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